Process of producing cyanids and cyanamids.



' "UNITED STAiES- PA -Entr- OFFICE.

CARL BOSCH AND ALWIN MITTASCH. 0F LU DWIGSHAFEN-ON-TI IE-RHINE, GER-MANY,

ASSIGNORS TO BADISCHE ANILIN & SODA FABRIK, OF LUDWIGSHAFEN-OhT-TIIE- RHINE, GERMANY, A GORIPORATIONf rnocnss or PnopuciNG CYANIDS-AND CYANAMIDS;

To all whom itmo'y concern:

llc it known that we, Cam. Boson. Ph. 1)., and ALWIN lilrrrascn, Ph. 1)., chemists, subjects, respectively, of the King of Prus- Sin, and the King of Saxony, residing at Ludwigshafen-on-thc Rhine, Germany, have invented new and useful Improvements in Processes of Producing- Cyamds-and Cyanamids. of which the following is a specification. e

In the specification of Letters Patent. No.

923,012 we have described the production of cyanids and cyanamids of the alkaline met:

-als and alkaline earth metals by heating a' titanium nitrid with carbon in the presence of certa n defined metallic cgmpounds'.

'e have now discovered that cyamds and 'cyanamids of the alkaline metals-or of the alkaline earth metals can easily be obtained by heating alunnmum n trld' ora SlllCUn nitrid (under which term we include both the nitrids and also thecarbid-nitrids of preferable, inorder to avoid as far as pos-' siblc a loss of nitrogen, to maintain the temperature as low as. possible consistent with the production of a homogeneous melt. The ,carbon may be employed, for instince,

in the form of soot, or coal, or of a. compound containing carbon (such for instance as pitch), and instead of these, or in addition thereto, gases capable of yielding carbon, such -for instance as acetylene, may be passed into the heated mixture.

Instead of using the pure nitrids of silicon or aluminium, mixtures thereof with one another or with other nitrids such -for instance as are obtained from the technically easily accessible oxid compounds or mixtures can be employed. Such mixtures of nitrids are generally advantageous since they melt at a lower temperature and can more easily be converted nto the cyanogen compounds.

The process of'our invention has the advantage over that described in Letters Patent No. 923,012 that the nitrids employed Specification ofietters Patent.

' Application filed April 5,

ratented-AprlZ, 191 910. Serial No. 553.555.

{contain a higher percentage of nitrogen and cyanamids can be obtained.

' "The following examples will-serve toiillus: trate further the ,nature .of our intention and how it can be carried into practical effect, but the invention is not confincd to these examples. The parts are by weight.

powder' and: sodium .carbonate for from 1012 hours in a current of nitrogen," at a fifteen parts of anhydrous sodium carbonate, and one .part ofsoot, and then heat the "while excluding gases which have an oxitllzmg action. The product obtained conand'sodium silicate, and for many purposes can be directly employed instead of the cyanid of commerce.

Example 2: Melt together, at a bright red for instance by heating China clay, titanium current of nitrogen gas for twelve hours at a temperature of from fourteen hundred seven parts of sodium carbonate, and one part 0 for one our; at a. red-heat.

Example-1: Mix together-five parts ot silicon mtrnl ,(obtamed for instance. by heating finely powdered quartz, charcoal temperature of from 1300'1400 0.. the said 7 method being described and claimed in the. co-pending application Serial No. 529,641),

sis ts chiefly of a mixture of sodium cyan'id ironsand and carbon in the presence of a" to fifteen hundred degrees'centigrade, saidmethod being'described' and claimed in the co-pending applicationSeriaFNo. 529,641),

ound charcoahand heat the whole,

consequently melts richer in cyanids and I whole to a red heat for a considerable time,

heat,- three parts of aluminium nitrid (obtamed. for'enainple, from alunnna, carbon,-

' Example Ila-Mix together two; parts of 1 aluminium-silicon-titamum nitrid (obtained 1 IWW. a.

Now what we claini is 1. The production of c? ids and cyan-ansids of the alkali metals an \Qfi thc alkaline earth metals by heating alnnii fi'im ni- 5 trid and silicon nitride with carbon in the. pressure of ahereinhefore defined metallic compound.

2. The production of cyanide and 'cyana- 'mids of the alkalimetals and of the alka- 10 line earth metals by heating aluminium ni trid and silicon nitrids'with carbon in the presence of a hereinbefore defined metallic. compound and of a fiux. i

3. The production of sodium cyanid by heating silicon nitrid with carbon in the 1's presence of a sodium salt.

-:l-.-'.lhe production of sodium cyanid by v heating silicon nitrid with carbon in the presencc of sodiu1n.carh'onate.

In testimony whereof we have hereunto 20 set our hands in the presence of two subscribing witnesses.

" CARL BOSCH.

ALW l N MlTTlLtSCI-l.

lVitnesscs t R Enxns'rfli' lvlcs,

A. RAUS'H'I'XGER.

It hereby certified that in Letters Patent No. 1,022,351, grantedApril 2,1912, upon the application of Carl Bosch and Alwin Mittasch, of Lullwigshat'en-omthc- Rhine, Germany, for ah improvement Processes of Producing cyanids and Cyenamids, an error anpeers in the: printed specification requiring correction as follows: 2, line 6: for the word pressure read presence; and that the said Letters Patent 'be read'with this correction therein that the same may conform to the record 0% the ease in the Patent Olfice.

Signed and sealed this 28th day of Maj; A. D., 1 912.

.- o. o. BlLLlNGS,

- .41.; My Commissioner of Patents.

Now what we claini is 1. The production of c? ids and cyan-ansids of the alkali metals an \Qfi thc alkaline earth metals by heating alnnii fi'im ni- 5 trid and silicon nitride with carbon in the. pressure of ahereinhefore defined metallic compound.

2. The production of cyanide and 'cyana- 'mids of the alkalimetals and of the alka- 10 line earth metals by heating aluminium ni trid and silicon nitrids'with carbon in the presence of a hereinbefore defined metallic. compound and of a fiux. i

3. The production of sodium cyanid by heating silicon nitrid with carbon in the 1's presence of a sodium salt.

-:l-.-'.lhe production of sodium cyanid by v heating silicon nitrid with carbon in the presencc of sodiu1n.carh'onate.

In testimony whereof we have hereunto 20 set our hands in the presence of two subscribing witnesses.

" CARL BOSCH.

ALW l N MlTTlLtSCI-l.

lVitnesscs t R Enxns'rfli' lvlcs,

A. RAUS'H'I'XGER.

It hereby certified that in Letters Patent No. 1,022,351, grantedApril 2,1912, upon the application of Carl Bosch and Alwin Mittasch, of Lullwigshat'en-omthc- Rhine, Germany, for ah improvement Processes of Producing cyanids and Cyenamids, an error anpeers in the: printed specification requiring correction as follows: 2, line 6: for the word pressure read presence; and that the said Letters Patent 'be read'with this correction therein that the same may conform to the record 0% the ease in the Patent Olfice.

Signed and sealed this 28th day of Maj; A. D., 1 912.

.- o. o. BlLLlNGS,

- .41.; My Commissioner of Patents.

Correction in Letters Patent No. 1,022,351.

It is hereby ccrtified that in Letters Patent No. 1,022,351. granted April 2, 1913, upon the application of Carl Bosch and Aiwin Mittnsch, of Lu dwig'simi'cn-0n tin-- Rhine, Germany, for an improvement in Processes of Producing Cyanide and Cyanamids, an error appears in the printed specification requiring correction as follows: Page 2, line 6, for the Word pressure rend presence; and that the said Letters Patent should he read with this correction therein that the some may conform to the record oi the case in the Patent Office.

Signed and sealed this 28th day of May, A. D., 1912.

[SEAL] ic. c. muymus,

9* .iv-g C'o'mmissionerof Patents. 

